In this letter, we transplant the epsilon-near-zero response into the design of a flexible antenna with invariant operating frequency using the magnetron sputtering and through-silicon-via crafts. The antenna is based on a section of substrate-integrated waveguide operating at its transverse TM100 and TM110 modes, to provide a difference pattern and a sum broadside pattern, respectively. The flexibility of the polydimethylsiloxane (PDMS) substrate enables the radiation pattern to be adjusted by arbitrarily bending the antenna without changing its operating frequency. The prototype operating at the TM100 mode around 6.58 GHz is fabricated and tested. Measured results are in agreement with the simulation, demonstrating stabilized operating frequency and radiation pattern adjustability in terms of gain, beamwidth, and mainlobe orientation. Our design may survive harsh deformation and lead to rich applications in flexible wireless electronics, such as biosensing and smart bracelet.

中文翻译：

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具有变形不敏感工作频率的 Epsilon-near-zero-inspired PDMS 基板天线

在这封信中，我们使用磁控溅射和硅通孔工艺将 epsilon-near-zero 响应移植到具有不变工作频率的柔性天线的设计中。该天线基于一段在其横向 TM100 和 TM110 模式下工作的基板集成波导，以分别提供差异模式和总宽边模式。聚二甲基硅氧烷 (PDMS) 基板的柔韧性可以通过任意弯曲天线来调整辐射模式，而不会改变其工作频率。在 6.58 GHz 左右的 TM100 模式下工作的原型被制造和测试。测量结果与模拟一致，表明在增益、波束宽度和主瓣方向方面具有稳定的工作频率和辐射方向图可调性。